Thanks for playing!!!
A lot of people asked me about checkpoints, but I think that would break the flow of a stage. I believe the bigger issue is that the game can be quite challenging and there isn't a lot of time for the player to really learn the mechanics before things start to get crazy. To fix this, I'm plan to make a few more stages and smooth the difficulty curve between them.
The ghost highlight is indeed a bug, and I found another bug with the vases by watching your stream :P. I'll get them fixed in the next version. I'm hoping to do a small QoL/bugfix update and a larger one with more content.