Thank you!
About the score, it would be a currency in the future. Because I have no plans of In-app purchases, skins or maybe attack damage can be bought with scores.
For the jumping sound effect, I would try and fix it. This might be too annoying if the player like spamming space key, I would need to fix that!
The slow motion part is kinda useless. I have no idea, and added it just for fun. Maybe in later I will delete the slow motion part from the tutorial, and leave it as a easter egg.
Also, the special attack can one shot enemies in the the later bug fix build! Thank you for the suggestion.
Overall, this comment is very helpful. Thank you so much. <3