YMMV / Xargon

• Anti-Climax Boss:
  • The reactors in each episode. If you stand in the right spot, you can bombard them with projectiles, and the robots they summon won't be able to hurt you.
  • Xargon himself becomes very easy with a rapid fire laser. Stand on the raised ledge, above where his minions spawn, and unload on him, and he'll be dead very soon.
• That One Level:
  • The penultimate level of the second episode, the Hidden Fortress. It's long, has a lot of enemies (some of which respawn), and plenty of dangerous spike traps, so you'll be hard-pressed to get through the level without spending gems on powerups.
  • The two penultimate levels in the third episode are significantly harder than anything else encountered so far, even harder than Xargon's Castle and the Xargbot Factory following them.