Thanks! the levels are made of hand-made "chunks" right now that are procedurally re-skinned and re-colored, but we are planning to add some map types that have more variation between them (spelunky-style procedural generation for example).
There isn't much to interact with just yet, and most of the items don't do anything beyond a little animation and a sound. The main exceptions right now are the syringe, sword, crowbar, and bow, which all work as weapons.
We'll continue updating the game to add more interactions with those items in the future :)