Oooooh, I love me some tower defense!! You've made a nice game, especially concidering it is made by one person alone, in a two week jam! I like the tower-swaping mechanic and the abiliity spread, cool ideas here.
If you want some constructive critisism:
I would lock the attack to the target in some way, atleast for some towers. Having a tower that doesn't hit anything didn't feel good to me. Also, the intro music sounds kinda jank when it's so hard panned from left to right. It's a cool effect, but as a solo-instrument it didn't work for me.
Congratulations on a good game! Best of luck :)
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Thank you for the feedback! I'm glad you enjoyed it!
I agree with the target lock criticism. I think that having the projectiles be homing or increasing the projectile speed to the point where accuracy no longer becomes an issue would have been a solid improvement. Maybe even have that be a reward for upgrading towers? And I completely understand about the intro music.
Best of luck to you too!