I played through the first underground area, beat the big robot boss, traversed the overworld, and reached the second underground area, where I lost my last continue. The shooting is a bit dull, enemies tend to attack at 45 degree angles, and you're looking for an angle of attack where you don't get it. The enemies take a ridiculous number of hits before going down. Actually, it reminds me a bit of Fire Power for the Amiga.
Screenshots marked with 🍒 are created by syltefar and are considered public domain, free to use for anything. If you want to, you can note where you found it and link to this page.