1) Super Plasma Bolt - hold down the UP-key for 2 seconds till you
hear "Charge up". Then press fire. This will cost you one hit.

2) Fireballs - move six or seven times from left to right and then press
jump. This will cost you one hit.

3) Shield - move six or seven times from right to left and then press
jump. You get a different colour and a shield appears. Last for a very
short time.

4) Invulnerability - hold down the UP-key for 2 seconds then press the
DOWN-key. You will blink and be invulnerable for a very short time.

Cheat Edit
For invulnerability, unlimited lives, unlimited bullets, and unlimited bombs

UNP^* BMENACE1.EXE
go sector 113 offset 61 - 64
change 2B 46 08 to 90 90 90

go sector 118 offset 254 - 257
change FF 0E 08 44 to 90 90 90 90

go sector 113 offset 117 - 120
change FE 0E 0D 44 to 90 90 90 90

go sector 139 offset 468 - 471
change FE 0E ED 43 to 90 90 90 90

* You have to have UNP in order to de-compress the EXE file - if u don't have it get version 4.11 from :

ftp://ftp.inf.tu-dresden.de/pub/msdos/archiver/execomp/unp411A.zip
ftp://ftp.cdrom.com/pub/dresden/archiver/execomp/unp411A.zip