I think it’s a good idea to use a defence game related to chaos. The style is pretty neat too. I agree with the others and I always recommend that adding sounds. I would say that is better to have less features but nice sounds than having more stuff without sound feedback. A little effort that adds a lot! Good job anyway!
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You have tons of sounds in https://freesound.org/, in opengameart as well and you can create your own in places like https://sfxr.me/. I guess I could play games without sound, but imho sound is a basic feedback way that generally makes games more fun to play. I would suggest to always invest some time in adding sound, it won’t take you much.