The album was produced by Daniel Fox of fellow Irish group Gilla Band; upon release, it received acclaim from critics.

[5] NME's Rishi Shah opined that "for all its heavy-hitting subject matter, the beauty in Letter to Self is the optimism it leaves you with, the noise well and truly drowning out the pain in an empowering fashion", calling it "a dynamic album that is reflective of the muddled world we find ourselves in".

[12] Ben Tipple of DIY described it as "musical exorcism at its very best, rallying against socially-imposed doubt and anxiety and – in its unique horror – finding welcome moments of inner peace".

[6] Reviewing the album for The Line of Best Fit, Joshua Mills summarised Letter to Self as a "punchy, indignant collection of raucous garage rock, packed with vitriol, self-reflection, and the occasional burst of light.

[9] John Amen of Beats Per Minute concluded that Letters to Self is "a perilous yet fertile exploration of existential dissonance", with Sprints "striving for and often achieving an urgency and vision strikingly their own".