I (also) found the platforming more difficult than it should have been due to the delay in the jump, but I figured out a tactic eventually. Also it was a nice surprise to see the row of bombs stop me from platform hoarding. Kind of like the fireball in original Mario games. I didn't make it to the boss fight, but the game played as expected as a platformer with a lot of bombs. Once I found the J key, my strategy was pretty easily successful, but still didn't solve the first level, or make it too much further.
I would have liked the Arrow keys to work as well as A D, etc. Also, I believe it says to press any key to start, but I found I needed to hit space.