Thank you for the awesome feedback!
We actually intended to include a lot more in the game—we even have a few different enemy types created, but we just ran out of time to test and implement them before the deadline. We definitely plan on finishing the game and releasing an updated, much more polished version as soon as the jam officially wraps up, so keep an eye out for that!
You're totally right about the coins. They definitely weren't supposed to act like that; we accidentally had a coin scene autoloading into the instance, which caused the placed coins to break and behave really strangely.
As for the sand, we actually did intend for it to behave like Minecraft sand and fall on you, but I never got around to coding it—so honestly, I have no clue what kind of glitchy chaos you experienced there, lol!
Again, we really appreciate the feedback and are looking forward to checking out and reviewing your submission too!