Not sure why, but I had 2 options when doing that mission, the other option slows the targets down as the laser hits them, great for bosses.
What's everyone's thoughts on those base units, I like them because they can remove the alien shields. However I was watching a video on Youtube for mission 7, the player didn't use any and got a better score than me.
Also, I'm only getting 21 FPS.
You're talking about the tower abilities, right? You unlock various abilities for different towers, and different lvl's of that ability as you play.
What i was talking about earlier was that almost every ability i had for a tower was to target whoever was 'strongest' (which i believe means has the most health) so as they walk out, instead of focusing on whoever is closes to leaving (furthest ahead) it fires a shot at whoever has the most health.
If you have a wave leaving with cores, and a new wave coming in, those towers will shoot at the new aliens because they're stronger, so those near-dead aliens with your cores walk out.
There are anywhere between 3-6 different abilities you unlock for each tower, and each ability has 5 levels.
http://steamcommunity.com/sharedfiles/filedetails/?id=317480243
Because of these tower abilities, the way a map plays out can be completely different with abilities which work well, compared to those which have little impact.
The first time i completed #7 on Hard, i used gun towers with 'shield buster', however this level has 2 very different types of lanes, the far one has fast aliens (some invisible, never shielded) and i used a yellow gun tower on that lane, and not on the closer lane, which is slower tougher aliens (some with shields) so bringin a 'shield buster' ability and not using it on the shield lane, meant that ability offered nothing, compared to 1 ability which slows the target and does more dmg per hit, and another which does burn damage and more dmg per hit also.
So when you first start playing, its probably impossible to do many levels on the Hard difficulty, let alone Elite. Unlock useful abilities for the towers you use, and it can make a big difference. I love laser towers, and normally use an ability that can cut through a shield, meaning i dont have to worry about placing towers to remove the shield. However on #7 i used an ability that spread the beam dmg wider and did multi-target dmg, and thats what made the difference between this level being IMO impossible (with what i had) and easily repeatable with what i'd now got access to. With high tier abilities, im sure Elite will be doable too.
Also, while that laser ability worked great (it basically made the 'fast lane' need less towers) it also meant i needed to break the shields else they'd do very little damage. So it completely changes how you plan a layout too.