Thanks for playing! Sorry you couldn't find more. Most of the stars are past some hidden paths that can be tricky to find. I haven't heard from anyone who found them all without a hint or two. Something to improve in a later version though no plans for that in the near future. I've just added some hints to the description at least.
And fun idea for the Mario block! I feel like that a surprisingly rare mechanic to see in platformers outside of Mario and could definitely be fun to play around with.