Minor annoyances.
Pretty fun. It's repetitive but the challenge keeps it interesting. It's too hard though. The weapon upgrades are too steep in cost and too shallow in actual effect. The mothership turret is next to useless. It needs to have more range, and more power. The accuracy being crap is sensical if it's a bigger weapon, but it seems to be weaker than the hand held gun.
When you get hit by bugs you get knocked the opposite direction of where you're facing and the recovery time is ridiculous. If you are turned the wrong way, you keep getting knocked back onto the bugs and never get a chance to recover.
Burst mode is useless since rifle mode is nearly the same if you just click rapidly and no cooldown time. The graphics could be more interesting. Maybe change weapon fire color to indicate upgrades and make it appear more powerful as well. That'd help a lot.
That's one of the reason top-down flying shooters are so popular, the weapons get ridiculously more violent looking which is enjoyable.
A thought on the knock-back issue:
If you get knocked back, why don't the bugs? I mean... what can a bug do? Bite, stab? But they're getting shot see... recovery time on that should be way worse. So I'd either give the bugs knock back or reduce the trooper knockback.
Also, I get it's a survival game, but there's not really much of a goal. Maybe htere is, but it doesn't seem like it is, and if there is it's not very achievable.
Being able to deploy turrets would be cool.
Hope that's useful. Thanks.