Fun game, took me 3 or 4 tries to beat with upgrades. Don't think I can beat it without upgrades, the stepping upgrade feels almost mandatory with how many enemies there are sometimes. Sometimes you're forced to take damage which doesn't feel that good, but by then I usually have a healing upgrade which is enough to manage
The small bugs are a bit difficult to hit with such a small aim, but I'm also not good at shooting games so maybe this game is easier for people with better aim.