Z / Left Mouse Click - summon tower
Hold X / Right Mouse Click - sell tower
The game is released on Steam: https://store.steampowered.com/app/2152410/WitchCraft_TD/
Steam version has achievements, new enemies, balance changes, small interface updates, music update.
Tileless main image is implemented with this snippet by @spellcasterhttps://www.lexaloffle.com/bbs/?tid=38884