Adult Swim has released a free-to-play version of its Silver Award-winning Castle Doombad with the added subtitle "Free to Slay".
As expected, then, this is essentially the same game but available for free. There are some other minor changes worth noting, as detailed in the Touch Arcade forums.
The lowest-price Doom Shekel pack is $4.99 (vs. 1.99 in the premium app). The amounts in the pack...