Thanks very much! It's my first real go at pixel art and I'm quite happy with how it turned out. Yep, those 4 days went quick! I spent a few hours writing out a prioritised to-do list and I think that was invaluable to getting the most important parts done in time rather than completely "winging it" or just keeping a track mentally.
Sorry about the controls confusion - if I'd had time I would've got the tutorial messages for keyboard done as well. I'm afraid I suffer from RSI and a gamepad is much more comfortable for me than a keyboard and mouse so that is the control scheme I put initial focus on.