also i don't quite get what "fuel" is, how it got replenished, and how the shop suddenly jumps from below.
i suspect the shop to be reached once i accumulate enough xp to the next level, and i suspect i refuel when i reach the shop.
adding some more ui to hint this would be great, eg: showing shop instead of LVLUP on the xp bar would help create the association.
you can also use more text prompts if the gb hardware is so limited.
or maybe change "CONTINUE" with "REFUEL AND GO" can help communicate it better