This makes the modifiers for removing tiles only work if you're using tools 0 or 1 (wall or background). In the future it might be worth it to add some extra subtools for spikes, but for now this should be fine.
Also, there was a small inconsistency with the tool drawn and the tool used. If you started holding down V, then started holding down Z, you would place tiles like you're holding V (9x9) but your cursor would look like you're holding Z (3x3). The `if` chain for drawing the resized cursors has been flipped around for this.
AllyTally