Currently planning what's going into the after-jam-version :D
That idea about the ring unlocking is pretty neat. perhaps separate levels, perhaps in level progression.
The different turret prices were a last minute (as in last 30 Minutes) addition, so, uh, yeah. That definitly needs to be improved. Especially if i'd introduce different turret types, or price scaling per slot used on ring or something.
So, thank you! feel free to post any other ideas you have as well.