Game starts a bit abruptly. Just having your main "PURIFY" screen out there and having a [Press Button to Start] on it goes a long way. You also don't spawn on the sign that tells you what's what, so it is easier to get lost. Speaking of getting lost, even if you have no level, just having some boundaries is nice, or the floor tiles extending only as far s you can move.
No bugs have been found, tech demo works as intended. Was pleasantly surprised by the 8-direction sprites. Thank you for posting this DD.