Classic rage plattformer you made there. Controls work fine. The visuals are simple but its pleasing to look at. Audio is functional.
I really dig the idea with the coins. For a rage game it can be pretty frustrating to always start from the beginning and doing all the levels again and again. With collecting coins and keeping the lifes you managed to make it rewarding to keep going.
I only made it to level 7 and couldnt fruther explore, cause I am bad at plattformers.
Overall I really enjoyed my time. You produced a good and polished game! Great job!