The first level was fine, but I had trouble after that. With the second level, the precision had to be precise when attempting to collect the first few "gems" after going up the first hill. In other words, some tweaking via object placement, could be a sound idea (same goes for a few miscellaneous jumps from one object to another. Aesthetically, I could understand going for a retro approach, but in the case of text, I suggest it be much more visible for people to see.