Thanks a lot! I'm very glad you like it.
Also, the possibility to chose the weapon and the armor will come in the future, which will greatly help to make the impossible mode a bit easier(though, Undyne will also have new attacks).
About the sprite, I understand that some people prefer the original one, but there isn't much I can do unfortunately. Some time ago, I thought about giving the player the possibility to chose between the original sprites and the new ones, but the problem is that I made a lot of different expressions and new frames for Undyne to make animations smoother, and I'd need to do the same with the original sprites in that case, which would take way too much time(especially the melting animation).
Also, don't worry, your English is very good.
Viewing post in Undyne the Undying fight remake comments
It shouldn't be too difficult, I checked the Falkkone's faq and it says that it's possible to use his covers for free fangames.
I only need to give it a better loop, I guess.
In the meantime, you can easily put your own music in the game, just go in this mod folder, then in the "Audio" folder. There you can replace the musics with the ones you prefer, though, they need to be .ogg or .wav files.
OK, thanks for checking that, I am sure you will make it awesome. I already knew about the option of modifying the audio files manually, the problem is that some themes have intros, and if I change the song the intro will remain, and when the fight starts the intro plays and the the song starts after it, giving a very weird effect, obviously this will not happen if the song you change is the original one, that has no intro. I kinda solved this with an edition program by editing the song and making my own intro, the results were not bad but neither were good. I am expecting to see your next version of this awesome game.