After your first interaction with Sans and Papyrus, you should soon find that all of the puzzle-solving leading up to Snowdin has been cut out. There's no need for puzzles when you want to murder everything you can. Take the tough glove from the storage box and equip it for +2 more...
If you're not sure if you want to use the pan, you can always put it in a Dimensional Box. Alphys will call you in the room to the upper left of the steam arrow puzzle and will explain that orange lasers must be moved through, whereas blue ones require you to be stationary, just...
you can ask him to re-explain them a few times for more clarity. Taking on this puzzle can be tricky; take your time with it to make sure you can get through it all. After finally getting through that puzzle, there'll be one more X/O puzzle for you to solve. It should easily be...