That last bit was intentional; we were going to make the game a bit like a Wario Land 4 stage where you'd reach the end (the computer in this case) and then go back to the beginning within a time limit, but we didn't have enough time to do that so we made it like it is. Would've added the UI showing the remaining health and keycards too, but same excuse. Might release an updated version with those things.
It's also the first time I've created a combat system of sorts, so there's not much I could do about that :P