Neat concept, the idea of a "reverse survivors" game is kinda cool.
Loved the grass/tree/leaf texture you used for the walls and the robot step sfx.
I don't know if the gameplay was especially interesting though? I got to 948 on wave 25 but I had to actively try to lose and it took 3 waves to do so. Since you keep going if even a single human is left, it's not that hard to just go and go forever.
The game also got VERY laggy starting around wave 16 when there were a lot of humans bunching up.
I bought a few upgrades but didn't really feel like I would have a different experience playing again. I got something that "weakens human abilities" ... what abilities?