Hello, here's some Ideas :
* Primaries :
- Pulse/Burst/Discharge(s)/Beam Thermal Lasers that take power from the engine overdrive and some variant with little IEM capabilities and anti-hightech shield. Adding some with limited ammo if powerplant can't support long assault
- Power based only Arc Shotgun and Arc Thrower with IEM capabilities
- Vanilla Railgun is around 90mm, maybe adding an experimental 25mm variant
- Plasmathrower (Flamethrower with some pen.)
- Some Smart Cannons 75mm, 100mm and 125mm (lower damage than it counterparts)
- 90mm, 105mm, 120mm and 130mm with HEAT/APFSDS, Airburst (cone and round), HE-I
- 60mm Chain Gun with HE-I, HE-AP, APFSDS, Airbust (cone)
- 35mm Autocannon with HE-I, HE-AP, AP, Airbust (cone)
- KS-2 Scattergun 20mm to -> 40mm (cosmetic) and a 68mm variant
- 40mm HE-I Grenade Machine Gun
- 152/155mm Artillery with HE-I, APHEBC (knockback) or HEAT (pen), Cluster, Proximity
- Plasma Cutter/Lance
* Secondaries :
- 160mm, 210mm, 300mm Mortars with Thermobaric Cluster (300mm), HE-I, Incendiary, Airburst (round), Cluster, IEM and Chimic (long travel time and reload)
- 60mm (6 or 8 shots) and 100mm (3 shots) Gatling Mortars with HE-I, Incendiary and Chimic
- Plasma Accelerators with low velocity but wide heated balls
- Electromagnetic Pulse Cone Wave doing IEM and Fatal Disfonctons for Unshield Electronics with a Microwave and an Audio-Cinetic Cone/Beam variant
- Chemical/Toxin Sprayer that behave like a Flamethrower with less range but more cone and can disseminate trouth alleys (maybe need a wind mechanic for this)
- Plasma/Flame and Smoke/CME Projectors(lol) that behave like Chemical Sprayer
- Experimental Weapons develop from organics insects/mutants like Psychic Wave/Beam that make an ennemy temporaly friendly or Acid Bullets
- Guided Swarm Rockets Pod
- Unguided Airburst and Proximity Rockets Pods
- Unguided AP/IEM/Chemical/Toxin/Smoke Rocket Barrage Pod and a heavy 4 HE-I/Chemical/Toxin/Smoke Pylons variant
- HE, Incendiary, IEM, Chemical/Toxin, Smoke Mines
- Plasma Cuter/Lance and a Lowtech Shield that brake
- Tesla Tower that act somewhat as shield spike, adding to the mech a possibility to stun when close and absorb electrical damage in front
- IA operated Landmates or Drones Bay
* Grenades Type :
- Tiny 12,7mm, 14,5mm and Laser Auto Turret or Drone
- IEM grenade to desactivate something for 4s
- Arc Spikes, launching like vanilla smoke but if nothing is between spikes vivible electricity is created, doing disfonctions to the one getting close
- Autoactive Tesla Tower, like spike but a big one
- Stick grenade
- 75mm Braided Alloy 254 Cable has a Lasso with a mechanics that add the possibility to attach it between 2 or 3 spikes or buildings, trapping mech foots, making them fall or stop when you are somewhere else
- Active Camo, becoming opticaly invisible but take a lot of energy
- Audio-Cinetic Impulsion to knockback and simulate the damage of a HE grenade around you but it take all your coolant and you can't use your systems until it become white
- IEM impulsion to desactivate everyone at 50m and use the same mechanic as ACI Impulsion
- Chemical/Toxin Dispersant doing damage behind you with a Smoke viariant
- Passive Defence System like hightech energy shield or Cage with 2/3 explosive hits health
- Barricade behaving as a rear shield. Same when deployed with an ammo storage taking 2/3 of your ammo that can be redistribute. Can block alley but can be destroy, maybe removable
- Jetpack, ECM launcher or 1/2 packs of what you want (ammo, armor layer)
* Others :
- Adding a heat generation to Miniguns, Arc guns, Plasmathrower and Lasers
- 2 new types of Powerplant, one with limited operation time like 3:25s but adds buff(s) or has a special attack or defence system, and one with limited actions
- Ennemies can destroy your powerplant, it activate your emergency batterie with very limited operation time and/or actions
- Adding Satellites doing Helldiver thing (Orbital Attacks or sending Turrets/Energy Shield/Heal/Ammo) and Air Support
Call Alduin and Cthulhu
- IA or Human operated Landmates/Exo-armor Friendlies or Drones Station
- Grouped exo-armor ennemies, holograms, mirages in desert, Experimental Anti-Grav (like hovercraft but can go on the top of building)
- Area Objectives to destroy like Depot with some Turrets guarding
- Boss, Mini Boss, Invincible Boss mission to avoid
- Missions like Defend Bases/Beach/Underground/Mountain/Space Station, Landing Beach, Climb to the top, Defend VIP, Save Population, Gather Troops and Objects, go A to B, Capture A/B/C/D points, Rearm somethings, Find a place to sneak, Avoid Bombardement, Invade with teams, rescue/connect to an experimental weapon or mech, rerieve informations, rescue your mech that has depleted energy from your failed previous mission
- Campagne with limited number of mech but some can be rescue with a post mission of a failed mission. Maybe after some times
- A Big Ballistic Nuke Missile Launch Defend Mission like in this video
- More monsters like in Mech Engineer, insectoïds, worms, mutants...
- Purchasable visual systems with Tiers like lvl 1,2 Zoom, next is Lvl 1,2 Sonar, then is Lvl 1,2 Radar, finaly Lvl 1,2 Thermal. Maybe an Experimental Anti-Grav Dorsal Wing for your Mech
- Landing from Space as a minigame with enemies AA shooting, launching from a submarine at sea level or underwater, protecting boat landing you from other boats, helicopter torpidoes and missiles
- Multiple IA Mech invading
- New Mechs with or without wheels (Bipeds, Tripeds, Quadripeds, Hexapods, Octopods) ?
- New Tanks for Enemies and Friendlies ?
- Play as Tank/VBCI/AAA?
- New Class System with just a weight mechanic for weapons ? Like, beginning the story with a landmate with max weight can autorised a Light 90mm anti-material cannon but not a 30mm Minigun, finally ending with a Secret Class Octopod autorising heavy Primary and Secondary Weapons at the same time ?
- Campaign and Arcade Mode with a option to be a Freelancer and buy things
- PVE Coop and PVP Multiplayer ?
- B-Spec Mode (lol), be an Operator like in Battlefield 4 and command IA or help an other gamer pilot. Maybe taking temporarily command of one system or weapon
- Charismatic IA operator partner(s)
- Unlockable Characters or Cosmetics
- Some Easter Eggs from like Ghost in the Shell, Appleseed, Black Magic, Akira, Gunnm, Cowboy Bebop, Evangelion, Gundam, Macross, Metal Skin Panic, Blue Gender, Garaki, Genocyber, Megazone 23, Metal Gear Solid, Brigador, Patlabor, Eighty 86, Metal Slug, Helldiver, Into the Breach, etc.
- AZERTY compatibility and controller Support
- Steam Workshop
Good luck implementing some of this ideas but i think going to steam is a must to obtain far more credits to developping this future hell of a game.