Awesome game, I am a big fan of twin stick shooters!
- Core mechanics feel nice, moving, aiming and shooting all feel good.
- Add something on the ground to make the playfield more visually interesting, or even effect gameplay. Even just small trees/rocks that block your shots and enemies would add some variety.
- You could also have persistence like when you kill an enemy it could draw to the canvas layer that matches up with your background. So you can get splats and stuff on the ground.
- The enemy ai needs to be more varied. It's ok to have the base type be direct seekers but there needs to be more AI types to mix things up. The large ants need a different behavior pattern for example.
- Maybe you could have a few different colors or types of ants that have different behaviors. There could be ants that lay eggs and if you dont destroy the eggs in time they hatch into more ants!
- Juice the players gun. Instead of tiny bullets make them bigger and they push ants back when they hit them and maybe takes less hits to kill but make the ants faster also. Take it up a notch.
- There were powerups but they shows up very infrequently. It would help enrich gameplay if there were more powerups more often.
- Maybe instead of choosing from 3 upgrades, you could let the player purchase upgrades. Then there could be coins to pick up scattered around each level.