Love the concept, I managed to get to 1 minute left and then I couldn't get the clicks on the lighter menu to register properly so ran out of fuel. I think given that the gameplay doesn't change in any way as time goes on, five minutes is a pretty long amount of time to play, especially in a jam.
I would've made it quite a bit shorter, so people playing can experience winning, or at least if they lose they're more likely to give it another go. If you unlocked more abilities or the enemies changed in some ways, I think it could justify the longer play time, but right now it seems to be just a battle of attrition, nothing really ramps up.
Great entry otherwise, just a few tweaks could make it even better!