Really like this concept and the game loop
- Initially I was thinking it was too slow, and progression would be cooler without the unlock system you had. Then, I liked seeing those upgrades getting you further and further.
- The music changing with your speed and the vocals that pop up later were pretty sick. Kept playing for a bit to see the progression in the music. The dump truck is insane lol
- The interpretation of decaying battery is interesting, we had it flowing around in our team brainstorms, and its still slightly loosely connected, but I like this.
- The menu I had to be careful around because one select means its bought. Maybe if you click it once, it brings up a description menu where you buy it.
- The progression could be slightly faster at the start, but balancing during a jam you did great already. Also is some slight improvement possible in graphics, but again in the jam you have lots already.
I probably would want to make a game like this soon.
Great work!