It's playable on PC or Mac and it's completely free.
No more Deltarune this year, but here's a look at what's coming
Deltarune creator on the game's origins, progress update, and more
Toby Fox - News - IMDb
Deltarune not getting new chapters this year, anniversary tease
Undertale Creator Releases Deltarune, A New Surprise Free Game
Who would win in a fight? : r/Undertale, omega flowey battle
Undertale Creator Says Next Chapter Of Deltarune Is Almost Done
Ralsei Deltarune Nendoroid release date, photos, pre-orders
Deltarune
Who would win in a fight? : r/Undertale, omega flowey battle
What are some of the things that make you feel extremely worried
Toby Fox - News - IMDb