Thanks a lot, Mr!
I see I could even put an entire level with each layer in a different png and import that into unity and slice the tiles, paste the level like that... not the most elegant way but I can add the object layer later inside Unity... well, it's a way. I'm gonna explore those other different approaches.
Thanks for your time, I'd be sure to show you what I'll make with all this in a near future, your assets are awesome, see you around!