Hi there, I discovered that the player can warp to the mouse ad infinitum by pressing W repeatedly, so long as the player hasn't bought the gun upgrade (not the laser), and after dying at least once (without said upgrade), I suddenly have a large amount of credits/currency to buy the upgrades :p
Also, in one of the last few levels (when you're high up), moving slightly to the left will cause you to fall through the floor and land near the previous door you entered (the same door that you entered at the end of the previous level) :p