Hello! First of all thanks for taking a look at, trying out and giving some feedback. I'm sorry if it was confusing so I'll try and address what you brought up here.
First you mention that point 4 in the How to Play section does not address what to do if you roll lower. This is because the three possible outcomes are covered in the subsections of point 4. The outcomes are that either the survival roll is higher than the danger roll (4a) or that the danger roll is higher than the survival roll, which could also be reworded as if the survival roll is lower than the danger roll. For the second possibility this is then divided into whether the danger roll is from weather (4b) or from wildlife (4c). Therefore all the possibilities are covered by point 4, just with a wording where you only have to focus on the highest roll.
Jumping to your third point about when you should roll on the last tables, that is related directly to point 4. If the danger roll is higher, you then roll on the table corresponding to the type of danger. These tables are also identified as 4a, 4b, and 4c respectively to link them directly to the How to Play section that is pertinent.
Continuing with your point about the Medical Supplies. The removing negative effects simply refers to anything that negatively effects your character. Essentially any ongoing effect from tables 4b and 4c, such as the Frostbite (-1 to all future rolls) or Injury (This result 2 times means death).
Jumping back up to your question about point 5, this is not addressed in the How to Play section as it comes up in the tables. Certain results such as Vehicle (bonus 1 movement today) and Disoriented (No movement today) can affect your standard progression of 1 per day. This is worded a bit poorly, as something along the lines of "potentially altered by step 4" would be clearer.
Moving to your note about the numbers on the equipment list, these actually do play a roll in the game play. At the top of the Equipment? section it stats "Add number to 1D6". Therefore in your example of using the Heat Pack you would actually add 2 and therefore have had a result of 5. This makes the equipment worth varying values.
Finally your final point about expanding the dangers, I agree it would be nice to have more than 6. However due to space constraints and wanting to keep the various tables at a consistent number of 6 that was a sacrifice I chose to make.
I hope this helps you, and anyone else, having some trouble following the rules. Hopefully you'll give the game another shot!