If it's based on alpha, you can make your own skin for the game and make all the floors have some alpha to them.
I've attached a demo marble tileset. If you could show me what it looks like with the reflecties I'd be very grateful.
I'll get a pic later, the current floors have about 60-70% alpha and they look pretty good.
I hadn't thought about the concept of mixing and matching alpha blended and non alpha blended tiles, you could have things like puddles it'd be neat.
rot you should probably test this on a mac
Yes I should, mac version is coming soon I still need to figure out the optimal way to port it.
 This won't be coming for a while but I built a proof of concept for stencil/volume shadows that will project onto objects as well.

For this to be fully setup I need to redo a lot of the rendering order, and do some batching of the dungeon tiles.
I need to do that anyway so I can fully support transparency on the current shadow systems that don't break the reflection.
In the end version I'd like to have an option for blob shadows -> cheap projection shadows -> stencil shadows, as each has varying levels of performance hits.