Not a bad attempt. I've seen worse.
What I like about this was that you kept a lot hitpoints for Boxy and touching enemies or spikes just decreased them but did not kill you off entirely.
Having said that, the controls were atrocious, Boxy's jumps were far too small and you can only complete jumps by sheer luck. Oh and it's badly bugged.
But, this showed a lot of promise. Work harder next time and I'll give you 5 stars.