I'm glad you discovered tower crafting mechanic! Right now there are 3 towers: Default tower, Sniper tower and circle tower. There is a table on the game page with tower crafts.
Thank you for playing and for a good review!
Cool theme implementation and interesting levels!
Very good enemy spawning timings, not too hard not too easy. Also a unique theme implementation!
I just added installation instructions on game page, maybe this will help
Please leave comments and your wishes for the game, so do not forget to write about the bugs in the game, it will greatly help me in the development!