YMMV / Ghost Hacker

• Demonic Spiders: Data Leeches. They can temporarily drain your resources to gain back lost health, making it annoying to defeat them. The more resources you have, the more they can heal themselves. Plus, even if you do kill them, you need to either wait for your temporarily drained resources to come back to you as they do not instantly regenerate, or use a Recycle program which costs your precious Energy.
• Goddamned Bats:
  • Corruptors will corrupt the data grid every few seconds. This is annoying because you cannot place a tower on corrupted squares, forces you to use a Garbage Collector to remove them and waste your energy, and also paves the way for Seekers to Dungeon Bypass your defenses.
  • Glitches temporarily disable nearby upgrades and towers, forcing you to place your towers in distant locations so they cannot reach them. This ability also makes them resistant to mines as they can disable them before stepping on the tile. Woe betide the player whose massively upgraded tower gets stunned, causing a major breach in their defenses.