actually intended to suggest somethin similar, though with the added suggestion of the Bushmaster's airburst rounds; it would reward proper zoning. Instead of giving them the standard videogame proximity fuzes, have them detonate only at the point of aim. They could punch through light cover and harm whatever's behind it, or punch through medium armor on tanks and mechs, acting like a slug gun but not doing significant damage. You could burst them early to saturate an area in frag, but it would be meaningless against armor. The way to use it for maximum effect would be to set the mouse cursor directly over the target, (or indeed, directly along the radius of a moving enemy's path if you're leading it) causing the round to airburst inside the target for significant damage.
Also, maybe i'm just too into airburst ordnance, but perhaps an MRLS battery with slow-ish projectiles that burst when you release the trigger or press it again etc?
And for a slightly more novel/niche weapon idea, i've always wanted to see/use a weaponized MCLCS in a game. What's more novel than a rocket dragging a firehose packed with plastic explosives?
I do kinda feel that these would be maybe difficult to implement/animate/balance/make fun, so they're humble and vague suggestions that I very much don't expect you to take too seriously. I just used to adore designing semi-cursed scifi weapons and figured if you asked for suggestions i might as wel-
Wait hey, bonus design for a ridiculous directed energy weapon i had awhile back! A Binary Plasma Driver, (because i have BPD, haha.) It's like a normal plasma driver, in that it ionizes gas into plasma and magnetically supercompresses it into a pseudo-geliform goop before magnetically accelerating it at coilgun/railgun velocity. Except it launches two bolts from barrels that are zeroed to put both projectiles on a collision path. One hypersonic gel ball is hydrogen, and the other is oxygen. At impact, the magnetic fields collapse, causing them to slough off all the spare ions, whereupon they stop acting like plasma and start acting like a mixture of highly compressed oxygen and hydrogen slammed together at ~3600 centigrade. That is, they have a violently exothermic oxide reaction that produces water vapor expanding with enough speed to produce a significant airblast and vacuum effect.
okay yeah i got a little lost in the sauce with this comment. apologies.
Your game is damn near exactly what i want in a 2d violence simulator, and i eagerly anticipate seeing more.