Its a great concept, marred by inconsistencies. 
- Sometimes, if you fly towards the center of the map with the jetpack, the camera will freak out and spin around, sometimes it won't.
- The sniper enemy is the biggest offender of inconsistency. It has entirely too many things it can do. Sometimes, it'll shoot a drone before firing, Sometimes, it'll fly straight at you without firing. Sometimes, it will shoot you then fly straight at you. Sometimes, it'll immediately fire as soon as it appears on screen and keep firing rapidly. And more often than not, its bullets will glitch and redirect back at you, even if you dodged them. I had bullets I dodged 180 back at me and kill me when i spun the platform. 
- Fighters have entirely too much hp and spawn far too frequently. Sometimes, the game will play a sick joke and spawn more than 3. If your using the rifle, it's impossible to kill all of them while dodging everything else, so your just dead. There are also times where even if i have managed to kill 3, the game just spawns 3 more instantly. 
- The chain explosion is EXTREMELY inconsistent. Sometimes, the group will explode like its supposed to, other times, it will refuse to kill any even if enemies are lined up like bowling pins. The actual effect for the explosion is also very dim, making it hard to tell if enemies are going to be in range of the explosion or not. They should be way brighter. 
- Several times i jumped on a platform, only to fall through it and to my death. the kill barrier is way too short, as even with the jetpack if that happens i just immediately die with no chance of recovery.
- The shotgun is bad. It leaves you wide open to snipers because its range is pathetic. It also takes too long to recharge and has way too few bullets. It needs a range increase, an energy recharge buff, or a capacity increase to at least 3. 
- The drones can spawn in bright areas and make it impossible for you to see them. I have died to that more often than i'd like. 

Overall, I enjoyed the game till i got to level 3. Where all these frustrations became a forefront due to how long i had to survive for. And unfortunately, it became too much for me. I dont know if this is still being worked on, but if that stuff was tweaked, i think the game would be far better.