Bombs - SPOILER-
Lol, the bombs aren't that hard, just hold space and the cursor keeps changing and you only have to worry about having the mouse over them before they go boom. I only got to the triangle shape, i don't know if it keeps working afterwards but it goes until there.
Anyway, great game overall, but a bit too repetitive and when you lost, you had to do it all again... try to put passwords or something.