Has potential, I doesn't seem to auto save which is a pity, And the controls are a bit weird, especially ENTER to fire. It is much better than CTRL, but a bit out of the way. How about a classic WASD + JKL? or even better let the user customise? also jumping is not very responsive.
I also encountered the following bug when dying both by falling (level 3 or 4) and by touching a bad guy (level 6 or 7 or 8) (On a Mac running Sierra, using latest Safari)
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An error occurred running the Unity content on this page. See your browser JavaScript console for more info. The error was:
Error: Out of bounds memory access (evaluating 'Module["asm"]["dynCall_iiiii"].apply(null,arguments)')
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EDIT: Nice and fast fix! Now it doesn't crash and the controls are improved!