I played this for faaaar longer than I should have, so you've done something pretty great with gameplay there.
I enjoyed that the mechanic was simple yet quite diverse in how it could be used, especially since your own defences can hurt you, so you can't (or at least shouldn't) build just a giant death circle or stand in the middle of a cluster of traps.
I enjoyed that you leaned into your kid making the sound effects, it gives your game a charm that wouldn't be the same if you had "realistic sounding" sfx
Good job!