For an island in the middle of nowhere it does seem to have allot of ammo just laying around, as if the pirates/Russians have so much ammo they just casually leave it where ever they feel like it.
The game does a good job of showing you what are valid jump point by their color and style choice. It also does a good job training you on what to expect from future actions like what you just did.
I have only one zone left to 100%, but I'm sick of the game now to be honest. I'm burnt out. The best boss fights by far are the 'tank' and the 'oni'...not sure if there really was any others.
I replayed the ending again just to get this. The entire ending went from about 40 minutes to 10 I think - I stormed right through it. I did die once though.