TLDR: For a Jam game, it's alright.
My first playthru commentary:
I'm 5 seconds in and already lost. There are no controls explained. I figure out the arrow keys and space: My movement is SLOW but my jump is HUGE. I follow the text. I jump, I die.
I got left, I try to read the text by jumping into it but I die and the text disappears. So, I'm left wondering where to go now.
I test my theory that jumping to the right is a trick and I should hug the floor. My guess works.
I reach a bonfire. With nowhere to go, I jump off the right and instead of landing below, I die again. I believe this game was programmed in such a way that there is a "right" way to go and then there's death. This, coupled with the slow movement and a death counter infuriates me. I press on.
I reach the second shard but have to rely on memory and backtracking to get it.
Wait, what are those sparks? They look like bonfires. Confusing.
Ah, some challenging platforming. Unfortunately, due to the slow movement, getting the 5th shard is a tedious & frustrating endeavour.
Ooh, I like the use of level design to get to the higher platform. Urgh, stuck again.
I try a different path. I thought this was an old path. I was wrong. More annoying platforming. The last shard! A text ending.
Well it was short and not rage-inducing but nothing to write home about.