I agree that an endless / timeless mode would be a welcome addition. I feel it would be just as entertaining with the addition of a larger map, and that a new mechanic would be welcome but unnecessary for me to enjoy the option of playing without a time limit. An undo button, even one limited to only the very last thing you did, would be great. I understand that this platform may not support all of that, and also that this is a mini-version of the larger game. I hope that you take the suggestions given here into consideration for the full game or for future titles from you.
This game is DOPE AF for the platform, as is.