I really like the idea and how you integrated different genres. I tried many runs to get most fun out of it but sadly you set difficulty level too harsh so that most people cannot enjoy your game. Here are some suggestions:
1. Triangles are essential variation of game but they're impossible to intentionally shoot them in current version of game. Making them slow is out of point(I really like how they maneuver) so you might want to either make projectile faster, use predicted shot(actually used in many high-speed shooters) instead of raw aiming, or add guided missile as a reliable option.
2. I'm not sure what was your thought on auto-fire, but since there are slow weapons like sniper or shotgun where timing is key, you should make player have control on firing. Alternatively, if your intention is to make this game more difficult and annoying, give some indicators of when each weapon is gonna fire like reloading gauge.
3. It seems like weapons shoot straight to the front instead of aiming at cursor direction. It can make some building strategy because most weapons are pretty useless when put in side hexes, but it feels very frustrating since I can't have strong focused firepower. Make every weapon aim at cursor and add basic predicted shot will be the most ideal control for your game imo.
There is also balance issues but in 48 hours game jam, I don't think that counts as flaw
Don't worry about long comment, I did enjoy your game and really liked it. I see a lot of potential and some improvements can make this game extremely appealing to everyone. You did well on jam and I believe you can do better afterward. Nice job and keep going!