Four points come to mind: - Build off of an existing level whenever possible, which is 100% of the time. You may not need every event from the old level, but that's much preferable to having to make every single one of them from scratch, and I've never even come close to running out of events, so that shouldn't be a concern.
- If you fell through a floor, that's probably a sign that the tiles aren't masked. Remember that masks are defined in J1E on a per-level basis, rather than being stored in the tileset file like they are in JJ2.
- Playing as Devan in his machine, issues of sprite size vs. player mask size aside, requires SPRITES.018, not SPRITES.002, since the guardian sprites aren't used in the regular Medivo levels.
- In response to your main question, I don't have HH95 installed right now, but you yourself can check whether they're incompatible simply by downloading someone else's level (made in J1E) and trying to run it.
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