This is a borderline hack between hard and kaizo. I was pretty much unsure about what to do, since the main questionable thing here is how hard the hack gets: most of the times there is so much going on that playing some levels without savestates is impossible.
And yes, I played the easy mode. The hard mode is more or less the same hack, but without a few platforms, and very minor edits pretty much.
No technical issues, except for the midway point in "Crystal Cave", which doesn't work. I highly suggest an update fixing this, since said level is one of those where a midway point is like a bless from god.
I went with accepting this either way. It's kind of a challengy, almost-impossible one, but it's totally beatable and (I assume) pretty fun to play for those who love hardcore hacks ala JUMP.