I also didnt have problems with saving through paying in Maximo. You always have enough coins, even in later, more harder levels for atleast 1 save, and its always easy to just go to the 1 level and collect all the coins you need, along with 2 free life ups

I liked how you could keep some power ups in permanent slots, so when you died you still have Midas Touch and Shield Trow combo for example. Try to keep those, as they really important and help out alot when trying to get all those hard to reach treasures

Wind Shield power up is also great, it lets you attack while you block with your shield, and quite handy in later levels where you fight those huge armor knights.