I can't help but wonder what exactly is the reason for it taking this long.
Cuphead, an indie game where everything is meticulously hand-drawn and animated frame by frame made by 2 dudes with no prior experience took less time to develop than a mere fraction of deltarune, and it released as a complete finished product with no early access bullshit, one of the best and most polished indie games of all time.
Compare that to deltarune. Is it a lack of resources? Hell no, writer's block? Toby already knows the ending to the game, it came to him in a fever dream before he even made undertale... I know making games is hard but come on, seriously? He could at least give a reason as to why it's so slow