This is actually cool how you turned the disadvantage of being limited in the number of time for models by making the game so simple. Kind of feels like the beginning stage of many big games that teaches you the main mechanics before releasing to the outer world.
For most parts, I liked the physics and the overall movement, especially since it was done in 48 hours. Controls, though, were hard to understand. Not so big of a problem to fix (just providing more help/proper tutorial is enough), but distracted from playing at first. Overall, I think a full fledged version of this game would've been even more fun!