Squareagon

Controls:

Jump - W, UP arrow, Space

Left/Right - A/Left arrow, D/Right arrow

Place block - Right click

Break block - Hold left click 

Change selected block - Scroll wheel (May be unintuitive, be careful)

Switch into creative mode (Limitless blocks, instant break) - Tab

Information:

The world is procedurally generated, meaning the you could "potentially" continue on infinitely. Although the terrain is quite basic so I've no doubt you would get bored before that. 

Worlds will NOT be saved so I wouldn't put too much effort into anything. Although they are the same every time (This will be fixed soon).

The only thing I can say is that this "game" is still in development  and I hope you enjoy it. :)