I liked the game! I thought it was a fun short little romp escaping the vampire bat in an attempt to escape. Rocks are a nice obstacle to avoid especially when they begin getting numerous later on, Although more variety i.e. Larger rocks would have been nice.
The powerups are helpful, Except the Pickaxe which I have noted causes the rocks to fly either left or right, sometimes right underneath you slowing you down a bit. The Bible (Or Holy Book) keeping the bat away was cool, although I swear it got less potent as the game went on, which is not a complaint by any means. And the Sprint potion I feel like could have been longer duration for less speed, as I found myself running into rocks as soon as I picked it up.
Graphically it's a nice 8bit style, I do think the text is a bit illegible when it comes to certain characters however, ultimately I think it looks good, Rocks are easy to identify while also looking natural. Items are vibrant enough to spot.
Music can be a little bit repetitive, but overall fitting.
Anyway you did a great job on the game. I offer you one massive cookie to counter all the coffee.