Controls:
Arrows to move
‘z’ to shoot/jump/attack/save/
switch characters/use floor button.
Space bar to pause.
Press z to use whatever ability you currently have- shoot, jump, etc. (except when standing on a floor button.)
When standing on a floor button, press z to use it. Floor buttons can be used to save, teleport or switch characters.
Why only 1 functional button? The old Atari 2600 only had 1 button. This game capitalizes on that limitation by exploring the idea of using it for multiple things by making it context-sensitive and switching characters.