I had trouble getting into it: 
There was very little guidance (as in: I didn't know what I represent, what my task was, why am I here). Also I had virtually no feedback on hits or misses, no projectiles to be seen, no impacts, just numbers going up, some of the time. That wasn't exactly engaging for me, personally. I especially couldn't see where to go (other than: into range to shoot green bacteria blobs). 
What would help the game most, in my opinion, is clear feedback on hit, on getting hit, on miss and on being missed by enemies. There were some shots sailing past, but I could hardly see them, much less make any meaningful decision based on them, because they were too fast and too unpredictable. Allow me to somehow track where the AI is shooting, i.e. more, but slower bullets, each with a trail, so I can see and respond. If you want to have a jump, make it much more substantial (higher, wider), so I can use it for meaningful maneuvering. 

Good idea. Rushing the bacteria spawn is fun, perhaps it lacks a bit of feedback when shooting. The crosshair seems to be a little buggy. Loved the weapon variety!