Thank you so much!
I would really like to add a lot more: functioning menu, tutorials, new enemies, better enemy AI, new buildings, different resources, better upgrading system, more islands, etc.
Unfortunately I ran out of time, I somehow managed to submit this version about 30 minutes before the deadline, I was contemplating to not submit it at all.
Seeing all the positive feedback really gives me a lot of motivation, I hope I'm able to turn this into a good strategy tower defense game.
Thanks again!