Trigger Knight, as a game, is fun. The whole concept is interesting, not exactly new, but has enough that it's pretty entertaining. However, there are a number of problems with it, which have been mentioned in other reviews. They are:
Lifespan is the cheapest way to drain your money or kill you that I've come across. Not only does it not make any real sense, but with each Soulshrine use, the cost goes up by 70 gold. That's even more than the armor and weapon growth by day, and it adds up too quickly to cope with unless you plan on using vouchers. The actual tools which you should be focusing on to stay competitive are overshadowed by a silly system whose spacing is too random to be reliable.
Battles are also too luck-based. I've died on more than one occasion by the Lifespan running out because the player and enemy decide to stand around for a good 20 seconds. Maybe the player has a chance to order a dodge or double-attack if they have a good reaction time (signified by red flash on the screen that lasts a second or two)? Also, the dragons literally require a Divine Edge to defeat, or at least high-grade armor and weapons with an Elixir, and start coming far too early to manage without aforementioned "cheap" and random item. Perhaps make a specific day, like the 15th, Dragon/Boss Day so you will know when dragons start appearing, and can prepare accordingly. After said dragons, when we'll probably be in near-death range unless a Divine Edge was used, in which case it shouldn't have an effect, put an elixir shop so we aren't immediately killed by the next enemy.
Certain shops that have obviously been randomized need to have useful spacing. An elixir shop when I already have elixir is a wasted shop, and same for all other items; 2 Soulshrines next to each other is redundant, but lifespan shouldn't be used in the first place; Armor and Weapon shops when I've already fully upgraded are wastes of space, so maybe Weapon shops become other places to use the vouchers or Divine Edge shops, and Armor shops become hospitals where they restore most of your health?
Those are the big complaints. Graphics and audio were pretty good, and the idea was very cool. Just make the game playable as a game, not as a frustration source.