I played this game on stream: https://www.twitch.tv/videos/2565553540?t=01h35m50s
Overall, lots of fun! I liked that I could build towers that would auto fire, and I could upgrade them by combining, by adding gems etc. The upgrades were quite interesting and varied, which is great. I didn't expect that the walls would be destructible though, not sure if it's because I accidentally sealed in all entrances. I was also a little unsure about some of the enemy telegraphs, I thought the green circle would heal me.. also, I don't know what the enemy's objective is: is it to kill me, or to get to some portal (like typical tower defense games)? It seems like it's to kill me, but I wasn't sure.
I think this game is in a great state, and with some polishing this would be even better!