There's a lot of content here which is super cool given the time limit! I enjoyed the core loop — fighting and grinding out coins and then mass spamming troops to overwhelm the other tower.
I think the tutorial could have focused more on how to spawn the troops themselves. I completed the tutorial without using them. When I clicked the green circle, they never spawned so I just moved on to the next area. The tutorial says LMB or Space to interact, but I could only get them to spawn using Space. Luckily I figured that out during the first stage and it was a lot of fun from there!
Only other issue was the lag spikes, but I imagine that's just from having to instantiate a bunch of new units at once. All in all, a cool project!