Thank you very much! There was a bug where you couldn't restart correctly. I uploaded a fix for it yesterday, probably shortly after you played :D
A timer/highscore system was something I thought about adding, but I could not decide on how to implement it (purely based on time or on amount of bombs used, etc.) and also ran out of time for the gamejam. I will continue working on the project, but there probably wont be any updates here in the near future (e.g. no highscore) as I feel like there's a lot of potential and have bigger things in mind, that will take some time.