First 2 stages of Power Blazer. Doing a test run of only getting 4 bombs, 2 for boss instakills and 2 for a skip later in the Space Center stage. There's an invincibility trick spamming select, but you need an empty slot to do it. So I've started off the first 2 stages that I acquire a bomb on, leaving the e-tank slot open for using it.
Stage order I've picked for the test (the characters after the stage are how many bomb (B) and energy tanks (E) I'll have after completing the stage):
4 bomb route:
1: Energy Development (+1B) (+0E) (normal boss kill, select Spam) 1B 0E
2: Residential (+1B) (+0E) (normal boss kill, select spam) 2B 0E
3: Weather (+1E) (+0B) (Boss -1B) 1B 1E
4: Space Center (+1B) (+0E) (skip -2B -1E) (normal boss kill, select spam) 0B 0E
5: Military (+0B) (+0E) (Select Spam Boss) 0B 0E
6: Life (+1B) (+0E) (Boss -1B) (CAN select spam second half) 0B 0E
This file completes the first 2: Energy Development and Residential. Fairly optimized, can't think of any easy ways to improve anything at the moment.