I liked the artstyle quite a lot. The enemy varieties were really nice and fun to play around. I specifically enjoyed the enemy that camouflages into the terrain and jumpscares you. I really enjoyed the movement as well; in the later waves, specifically wave 7 and onward, it's really challenging [in a good way] to bob and weave through enemy attacks.
My greatest drawback is how long it takes to get to those more challenging waves. Waves 1 through 6 are very slow, so by the time I've reached the more demanding waves, I've grown pretty bored. Then if I die in those later waves, I have to go through the long wait til wave 7 again. Either speeding up the passage of waves or spawning newer enemies in the earlier waves would mitigate the issue, I assume.
Overall very fun and simple game! I enjoyed my playthroughs; Good Job!