Nice tileset! The tileset + background gives you that nostalgic underground level. As what I can see, this fits well with SMB2 type of episodes/levels.
Keep up the nice work!
I am Fish-Kun, a friendly Cheep-Cheep SMBX user.
Need to ask me something? Feel free to leave me a Private Message about something that you want to talk to me privately.
That's all for my signature, as Images on Signatures seems too mainstream.