Not a bad survivor-like. Fun for the first two waves - wish we had more of that.
Choosing a debuff every wave is an interesting mechanic, but i dont know if it really works. These kind of games thrive on growth, so de-growth is antethethical to the genre, imo.
The heat mechanic seemed a bit bugged? if i reached max heat but didnt stop clicking i would keep firing for quite a while. In practice, i think players will just hold down the shoot button anyway, removing all strategy.
On level 3, the boss teleported on top of me and i died. didnt feel great. The player pretty much has no chance against it.
overall, i think you've got the bare-bones start of a decent survivors-like.