At the heart of the experience...
Undertale Yellow introduces new mechanics that add depth to combat while maintaining the core philosophy of choice and consequence that made the original so compelling. https://undertaleyellow.io
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Henry Robt commented
Undertale Yellow is one of the best examples of a fan project that respects the original while adding its own ideas. The yellow SOUL’s shooting mechanic gives combat a different rhythm, but the spare-or-fight choices still carry real consequences. If you enjoy this kind of game, I keep a small Undertale reference page here: https://theudertale.com/ and it covers the original’s characters and story well. The prequel plot also adds depth without leaning only on nostalgia, which is why it stands out among fan games.