I had a hard time making a proper tutorial so here goes:

Most importantly of all:

The big button works to skip to the next wave, and (because I hadn't the time to implement it correctly) press "T" to pull up the debug menu to change the enemy type, so you can for yourself test out the different types (they don't all work anyway though...)

WASD or Arrow Keys to move around,

SPACE to jump on top of walls

1,2,3,4 (or scroll wheel) to choose between "Sword" "Bow" (3 not implemented...) and "Hammer" (which currently just works to repair the main tower.

E to interact with the main tower or any towerdefense objects. (only targeting works for towerdefense objects work...