Always carry a monster corpse if possible. You can use them to safely trigger floor spikes or feed them to Evelius to avoid being poisoned by his burp.
Are you playing Lucky Tower Ultimate v0.1.7? Share your best death in the comments below. Lucky Tower Ultimate v0.1.7
Remember that your "health" is represented by your teeth; once they're all knocked out, you're done! Check the Doors: Always carry a monster corpse if possible
The update resolved a softlock where choosing the monster transformation resulted in Evelius becoming "braindead" and unresponsive. once they're all knocked out